Air-pump.



A. R. BERCK & F. TJADEN.

AIR PUMP.

APPLICATION FILED SEPT. 17. 1914.

1,167,255.. Patented Jan. 4:, 1916.

UNITE y ALVIN BERCKANDFRED JA 'ENzQE HASTI GS; NEBltfiKA- IR-P MSpecification of Letters Patent.

PatentedJan. 4,1916,

Application filed- September 17, 1914: Serial No. 862,176.

county of Adams and Stateof Nebraska,-

have invented certain new and useful Improvements 1n Air-Pumps, of whichthe following is a specification.

Our invention relatesto air pumps, par

ticularly to such as are used for the inflation of vehicle tlres and ofa portable nature,-

and the main object thereof is toprovide such'apump-provided with aself-contained storage chamber for compressed am, whereby the air iscontinuously forcedthrough the relatively small valve of the tire,- regardless of the direction of movement of the pumping element.

A further object is to provide a combina-- tion cup and flap valve forthe pump, whereby the operation later described is rendered possible. l

A further object 1s to provide the come pressed air reservoir within thepumping;

element, whereby the pump is rendered very compact, though of greatefliciency; and further objects are to provide such pumps which. aresimplein construction and easy of operation, composed of but few partsnot likely to get out of order to require repair, render the partseasily accessible'for substitution or repair, and comparatively ineX-pensive.

The invention is fully described in the following specification, ofwhich the accompanying drawings form a part, in which like parts aredesignated by the same reference characters in each of the views, and inwhich Figure 1 is a central, vertical, section taken through a pumpconstructed in accordance with our present invention; Fig. 2 is asection taken on the line 22 of Fig. 1; Fig. 3 is a fragmentaryelevation thereof; and Fig. 4 is a detached view of a valve which weemploy.

In the drawings forming a part of this application we have shown apresent pre-- ferred form of embodiment of our invention, comprising atubular reservoir 5 having a ported block 6 in the top thereof and aported block 7 in the bottom thereof, the port 8 in the former beingcontrolled by a flap valve 9 normally held closed by means of a platespring 10, or equivalent, and the latter of which communicates throughits port 11 with the flexible hose connection for the vehicle tire, asshown at 12, Fig. 1.

Vertically slidable upon the casing of. the reservoir 5 is a tube l'3iofan interior diameter-slightly exceeding the exterior diameterof thesaid-reservoir, and provided with relatively loose guiding means 14.- inthe bottomthereof, a detachable'cap-15 at the-top thereof, and anoperating handle 16 secured to said cap, and a cup valve or packing 17is interposed between the reservoir- 5 and the tube 13, saidcup and.flap valves being preferably integral and held-inposition by means of aported disk 18 and screws 19,.

At. the base of the reservoir we provide a detachable wire tread 20 of.simple yokeshape'for maintaining the pump in vertical position by thepressure of. a foot thereon, the ends of which enter holes 21 in theblock 7, and we also'provide similar holes 22 in the lower end of thetube 13 for the reception of said tread ends under conditions to bedescribed;

When the tube 13 is raisechair enters between the cup valve 17 and theinterior of said tube, thereby filling the same with air at.-atmospheric pressure, the flap valve 9 being held closed in thisdirection of tube movement; when said tube is forced downwardly,however, the cup valve prevents the escape of the air within the tube 13and the flap valve is opened to allow the air to pass within thereservoir, and this forcing of air into'said reservoir occurs upon eachdown: ward tube movement, thus filling the reservoir with air under apressure determined by the number of actuations of the tube 13 and thepassage of air from the reservoir to the tire being inflated.

In view of the relatively small area of the hose channel with respect tothe area of the reservoir, this escape of air from the reservoir isrelatively slow, thus maintaining air under pressure within the same,and of sufficient pressure to maintain the tire valve open and to forceair into the tire, the pressure within the reservoir eventuallyexceeding the contemplated pressure within the tire, and it will be seenthat, if we provide a closure for the hose connection 12, a pres sure ofair suflicient for inflating a tire may be produced before the pump isconnected with the tire, the pump thus performing the functions of apump, as such, and of a storage tank. a

The cup and flap valves, as stated, are preferably made of a sheet 23 offlexible material, such as'leather or equivalent, thus materiallysimplifying the pump construction, and it will thus be seen that ourpump is forcing air into a tire in each direction of movement oftheoperating handle.

To take the pump apart, all that is necessary is to remove the cap 15 bymeans of the handle, the tread 20, and the connection 12, thuspermitting the reservoir to be slid upwardly out of the tube 13; if itis only desired to examine or repair the valves, all that is necessaryis to remove the cap 15, and the tube 13 may be slid downwardlv to reston the connection 12, thus exposing the valves, the reservoir being madeof a length permitting this, and the tread may be connected with thetube 13 in order to hold the same against rotation in the removal ofsaid cap by merely inserting the inwardly turned ends thereof into theholes, one of which is indicated at 22.

Our pump is very simple, though highly efficient, the main feature, asstated, being the provision of a compressed air containing piston.within the outer cylinder, port able therewith, and of an internaldiameter far greater than that of the hose connection passage, insuringa constant passage of air tothe point of use.

l/Vhile we have shown certain details of construction, it is obviousthat changes thereover may be made, within the scope of the followingclaims, and, with a reservation thereof to ourselves, what we claim asnew, and desire to secure by Letters Patent, is 2-- 1. A pump,comprising a tubular reservoir, a ported block at the lower end provided with a lateral nipple, a ported block at its upper end formed oftwo members one of which is flanged and in threaded engage- Copies ofthis patent may be obtained for five cents each,

per side thereof, a cup valve held between said members'and providedwith a flap in said recess serving as a valve for said port,

a cylinder telescoped over said reservoir to fit said cup valve, andmeans for sealing the top of said cylinder in detachable engagementtherewith.

2. A pump, comprising a tubular reservoir, a ported block at the lowerend provided with a lateral nipple, a ported block at its upper endformed of two members one of which is flanged and in threaded engagementwith said reservoir and the other of which is detachably held thereon,said threaded member having a recess in the upper side thereof, a cupvalve held between said members and provided with a flap in said recessserving as a valve for said port, a cylinder telescoped over saidreservoir to fit said cup valve, an internal guiding ring at the lowerend of said cylinder adapted to be engaged by the flange on saidthreaded member to limit the cylinder movement, a detachable cap forsaid cylinder to limit downward cylinder movement, and detach able meansexteriorly of said reservoir at the lower end thereof serving as asupport for said pump and limiting downward movement of said cylinderwhen said cap-is removed to give access to said valves.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

ALVIN BER-CK. FRED TJADEN.

lVitnesses:

U. S. ROHRER, B. F. ROHRER.

by addressing; the Commissioner of Patents,

Washington, I). G.

